Concentric shaft lubricating structure, dual-motor hybrid power transmission mechanism and vehicle

The concentric shaft lubricating structure comprises a box body, a driving motor shaft, an engine input shaft and a power input shaft, the driving motor shaft, the engine input shaft and the power input shaft are installed in the box body and coaxially arranged in sequence from left to right, the driving motor shaft and the engine input shaft are each axially provided with an oil duct in a penetrating mode, and the driving motor shaft oil duct communicates with the engine input shaft oil duct; gaps capable of allowing working oil to flow are formed between the left end and the right end of the driving motor shaft and the box body and between the left end and the right end of the driving motor shaft and the engine input shaft respectively, and a gap capable of allowing the working oil to flow is formed between the right end of the engine input shaft and the power input shaft. An inlet oil duct communicated with the left end of the driving motor shaft oil duct is arranged on the box body, an adjusting assembly